Coumarins are bioactive secondary metabolites and could be found in the fruits of Umbelliferae. Prangos
asperula Boiss. is an Iranian native plant which is found wild in many regions of Iran. Osthol, a prenylated
coumarin, was isolated from the hexane extract of the fruits of P. asperula and its structure was elucidated
using 1HNMR, 13CNMR, IR and MS spectra. The essential oil of the aerial parts of the plant obtained by
hydrodistillation was also investigated by GC-MS. Forty-seven constituents have been identified of which
2,3,6-trimethyl benzaldehyde (18.4%), δ-3-carene (18.0%) and α-pinene (17.4%) were the main constituents
of the oil.
